Joel Mark Witt

“For Introverts, the inner world (the world inside of themselves) is the “real world,” the world that really matters. For Extraverts, the external world (the world outside of themselves) is the real world. It is this inner or outer reality from which a host of behaviors emerge.”
― Joel Mark Witt, Personality Hacker: Harness the Power of Your Personality Type to Transform Your Work, Relationships, and Life